The elements X, Y, Z and J have the indicated electron configurations starting with the innermost shell. The most metallic element is :

(a) X = 2, 8, 3

(b) Y = 2, 8, 8

(c) Z = 2, 8, 8, 1

(d) j = 2, 8, 8, 7

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correct increasing order of density is:

(1)Li<K<Na<Rb<Cs

(2))Li<Na<K<Rb<Cs

(3)Cs<Rb<K<Na<Li

(4)K<Li<Na<Rb<Cs

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A common trend to both groups I and II elements in the periodic table, as the atomic number increases are:

(1) oxidizing power increases

(2) atomic radius increases

(3) maximum valency increases

(4) reactivity with water increases

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On going down a main subgroup in the periodic table (example Li to Cs in IA or Be to Ba in IIA) the expected trend of change in atomic radius is a :

(a) continuous decrease

(b) continuous increase

(c) periodic one, an increase followed by a decrease

(d) periodic one, a decrease followed by an increase

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Lanthanoid contraction is caused due to :

(a) the appreciable shielding on outer electrons by 4f electrons from the nuclear charge

(b) the appreciable shielding on outer electrons by 5d electrons from the nuclear charge

(c) the same effective nuclear charge from Ce to Lu

(d) the imperfect shielding on outer electrons by 4f electrons from the nuclear charge

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The outer electron configuration of Gd (Atomic no. 64) is:

(a) 4f3 5d56d2

(b) 4f8 5d106d2

(c) 4f4 5d46d2

(d) 4f7 5d16s2

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The radius of La3+ (at. no. 57) is 1.06 A° The radius of Lu3+ (at.no. 71) might be:

(a) 1.06  A°

(b) 0.85  A°

(c) 1.60  A°

(d) 1.40  A°

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Ionic radii are

[2004]

(a) inversely proportional to effective nuclear charge

(b) inversely proportional to square of effective nuclear charge.

(c) directly proportional to effective nuclear charge

(d) directly proportional to square of effective nuclear charge

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The correct arrangement of increasing order of atomic radius among Na, K, Mg and Rb is 

(1) Mg<K<Na<Rb

(2) Mg<Na<K<Rb

(3) Mg<Na<Rb<K

(4) Na<K<Rb<Mg

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Which of the following is smallest in size?

1. Na+

2. F-

3. O2-

4. N3-

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